Found these batteries at MCM Electronics for 5.93 with free shipping today.
Use these four Source Codes GS401 DD1595 BCKTEN A508AB
Varta NiMH PCB Mount Memory Protection Battery 3.6V 150mAh | 3/V150H (3V150H) | Varta

 

Or, you can get a pair here less cost with free delivery ( http://www.ebay.com/itm/2Pcs-Ni-MH-Button-Rechargeable-Battery-3-6V-150MAH-PLC-Data-backup-power-2P-1P-/221023510118?pt=LH_DefaultDomain_0&hash=item3376071e66 ).


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I personally haven't had very good luck with rechargeable NiMH batteries from China.

I should add that I also bought one of these boxes to remotely mount the batteries http://www.mcmelectronics.com/product/21-18760

and these mids for the doors http://www.mcmelectronics.com/product/54-735

 

These batteries have just three mounting teminals and and will need to be modified to fit the board.

 

I read about that in the post about rebuilding the sirens. I plan on cutting the siren open and removing the originals then mount the new ones in their own little box under the hood. I'm thinking maybe putting that box inside the RCM box.

 

I accidentally bought the same batteries if anyone wants them...let me know...

 

I have a post here (click) that shows the simple mod to the battery to make it have the four terminals and fit the board.

 

Excellent post about the batteries. What gauge is the copper wire you used. I'm not sure what my PCB looks like yet.

I'm busy doing the SRT-6 wing fix after reading your post on sealing it up. I picked up some Duck Rope Caulk tonight at Wally World and some EPDM weather stripping.

https://www.crossfireforum.org/forum...ing-plate.html

 

Here's the link to the pdf tutorial for replacing the batteries which includes where to buy the correct 4-post batteries. No modding needed on these batteries.

Tutorial on replacing the 2 3v150h Varta batteries in the alarm module.pdf